Relax containers lower bound

It seems future resolvers will actually use a lower version of this
package (0.6.4.x) than current LTS (0.6.5.x) for some reason, so using
--pvp-bounds=lower on release is too restrictive for (e.g.) nightly.

Our latest version (0.7.0.0) has had this bound relaxed by revision.
This commit just aligns main and need not be released.

package.yaml

@@ -56,7 +56,7 @@ executables:
       - aeson >=0.6
       - aeson-pretty
       - bytestring >=0.9.1.4
-      - containers
+      - containers >=0.6.4.1
       - http-conduit >=2.0
       - load-env
       - text >=0.7

yesod-auth-oauth2.cabal

@@ -4,7 +4,7 @@ cabal-version: 1.12
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 927e814961c7ffd910b2b3e67303b31ae03b2d123db27394ee29cb6756aeb443
+-- hash: e428bd6adf4ff13adcafddd69b8050d4272fa51d127d2c24d6f117dc874b6fc4
 
 name:           yesod-auth-oauth2
 version:        0.7.0.0
@@ -97,7 +97,7 @@ executable yesod-auth-oauth2-example
     , aeson-pretty
     , base >=4.9.0.0 && <5
     , bytestring >=0.9.1.4
-    , containers
+    , containers >=0.6.4.1
     , http-conduit >=2.0
     , load-env
     , text >=0.7